Winder

ABSTRACT

Carrier roll winder for winding a material web divided by longitudinal cuts, e.g., a paper or board web, which has two carrier rolls arranged to form a roll bed on which the wound rolls rest with axes aligned as they are wound up. A pressure roll system is included, which has a crossmember running horizontally and displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed. The crossmember, including the pressure roll carried by it and other units carried by it, has a mass M of 9.25·I 2.5 , where M is the mass in kilograms and I is the length in meters. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 10 2004 051 253.1 filed Oct. 21, 2004, the disclosure of which is expressly incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a carrier roll winder for winding a material web divided by longitudinal cuts, in particular a paper or board web. The winder includes two carrier rolls, between which there is formed a roll bed on which the wound rolls rest with axes aligned as they are wound up, and a pressure roll system which has a crossmember running horizontally and is displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed.

2. Discussion of Background Information

Before they can be dispatched, material webs have to be wound onto dispatch or finished rolls. The roll cores usually used for this purpose are cores which preferably consist of paperboard. The finished rolls are produced by what are known as parent or spool rolls, which are produced at the output from a paper machine or following supercalendering, being unwound, cut in the longitudinal direction and then in each case wound onto cores. These cores lie in a winding bed formed by two carrier rolls of a carrier roll winder. At least one of the two carrier rolls is driven.

Arranged above the roll bed formed by the carrier rolls is a pressure roll system, which comprises a continuous pressure roll or individual pressure roll segments and is fixed to a horizontal, vertically movable crossmember. The pressure roll system is used to press on the wound rolls from above at the start of winding, in order in this way to increase the line load on the contact lines between the wound rolls and the carrier rolls. The winding hardness of the wound rolls is influenced critically by the line load. At the start of winding, the line load from the contact weight of the wound rolls is not yet sufficient. Therefore, an additional pressing force is applied by means of the pressure roll system and, as the wound roll weight increases during the winding, is reduced accordingly. A winder having a pressure roll system of this type is known, for example from DE 102 51 592 A1.

Hitherto, the crossmembers have been designed to be heavy and mechanically rigid. The crossmember is constructed by means of steel plates welded to form a rectangle. As long as a specific rotation speed of the winder is not exceeded, such a construction of the crossmember is possible and cost-effective.

However, in the case of high-speed machines, the higher oscillation frequencies which occur in the crossmember carrying the pressure roll leads to a worsening of the winding result.

SUMMARY OF THE INVENTION

The present invention improves a winder in such a way that, even at a high winding speed, material webs can be wound up into large rolls of high winding quality.

According to the invention, in a winder of the type mentioned at the beginning, the crossmember, including the pressure roll carried by it and other units carried by it, has a mass M of 9.25·I^(2.5), where M is the mass in kilograms and I is the length in meters.

The invention is based on the empirical finding that, with an operating width of preferably more than 4 m, such a selection of the mass leads to a crossmember (including the units connected to it) which does not oscillate or oscillates only insignificantly. Given a suitable choice of materials, a crossmember having this mass has the same mechanical rigidity and strength as conventional crossmembers. As a result of the lower mass of the crossmember as compared with the prior art, its oscillating mass is also lower and it is therefore possible to influence the oscillatory behavior better; this also applies to winding speeds of more than 1500 m/min.

Another measure according to the invention is that the maximum permissible deflection of the crossmember is 60·10⁻³ mm/m. This magnitude of the deflection applies irrespective of the length of the crossmember.

It is also advantageous if the crossmember, including the units fixed to it, that is to say the pressure roll or a plurality of pressure rolls and a synchronizing shaft, has a weight of less than 600 kg/m, in particular less than 550 kg/m, based on its length. When a mass of 545 kg/m is reached, the value falls 20% below the value of the mass of the crossmember, including the units fixed to it, to be estimated in accordance with the prior art.

A further advantageous refinement is that the crossmember has the shape of a double-T beam.

All the measures described above can be implemented in conjunction with one another or independently of one another and/or in conjunction with the teaching of patent claim 1, that the crossmember, including the pressure roll carried by it and other units carried by it, has a mass M of 9.25·I^(2.5), or independently thereof.

It is advantageous if the double T beam has a web element introduced between two flange elements which additionally has a wavy structure transversely with respect to the machine direction.

In this case, a value is advantageously chosen for the wavelength which lies between one times the flange width and five times the flange width.

In addition, the ratio between the height and the width of the crossmember can lie in a range between 0.8 and 3 times the width.

In this case, at least one of the flange elements and/or the web element has a honeycomb structure. This can be covered by a layer of aluminum, steel or a fiber reinforced plastic. A highly loadbearing plastic has carbon fibers (CRP) embedded in it. Glass fibers can also be used to form a highly loadbearing material, if they are embedded in a reactive resin (GRP).

A refinement in which the crossmember consists wholly or partly of steel, of aluminum or of a highly loadbearing plastic reinforced by a glass or carbon fiber composite or of another composite material is advantageous.

Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described in the detailed description which follows, in reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:

FIG. 1 illustrates the weight of the crossmember as a function of the length of the crossmember; and

FIG. 2 illustrates an embodiment of the crossmember in a schematic perspective illustration.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

Depending on the length, measured in meters, of a crossmember, which is illustrated on the horizontal axis of FIG. 1, the crossmember, including the units fixed to it, has a weight, measured in kilograms (plotted on the vertical axis), which rises exponentially. The result is M=9.25·I^(2.5). Here, M signifies the mass and I the length of the crossmember.

In one exemplary embodiment (FIG. 2), the crossmember has two flange elements 1 and 2 in each case lying at least substantially horizontally and also a web element 3 which joins the former and which has a wavy course transversely with respect to the machine direction.

The crossmember illustrated in FIG. 2 comprises an aluminum profile, for example, and has an inner lining of plastic reinforced with glass fibers.

It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to an exemplary embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.

List of Designations

-   1 Flange element -   2Flange element -   3 Web element 

1. A carrier roll winder for winding a material web divided by longitudinal cuts, in particular a paper or board web, which has two carrier rolls, between which there is formed a roll bed on which the wound rolls rest with axes aligned as they are wound up, and having a pressure roll system which has a crossmember running horizontally and displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed, wherein the crossmember, including the pressure roll carried by it and other units carried by it, has a mass M of 9.25·I^(2.5), where M is the mass in kilograms and I is the length in meters.
 2. The carrier roll winder for winding a material web divided by longitudinal cuts, in particular a paper or board web, which has two carrier rolls, between which there is formed a roll bed on which the wound rolls rest with axes aligned as they are wound up, and having a pressure roll system which has a crossmember running horizontally and displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed, in particular as claimed in claim 1, wherein the maximum permissible deflection of the crossmember is 60·10⁻³ mm/m.
 3. The carrier roll winder for winding a material web divided by longitudinal cuts, in particular a paper or board web, which has two carrier rolls, between which there is formed a roll bed on which the wound rolls rest with axes aligned as they are wound up, and having a pressure roll system which has a crossmember running horizontally and displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed, in particular as claimed in claim 1, wherein the crossmember, including the units fixed to it, has a weight of less than 600 kg/m, in particular less than 550 kg/m, based on its length.
 4. The carrier roll winder for winding a material web divided by longitudinal cuts, in particular a paper or board web, which has two carrier rolls, between which there is formed a roll bed on which the wound rolls rest with axes aligned as they are wound up, and having a pressure roll system which has a crossmember running horizontally and displaceable vertically, to which a pressure roll having an axis parallel to the crossmember is fixed, in particular as claimed in claim 1, wherein the crossmember has the shape of a double T beam.
 5. The carrier roll winder as claimed in claim 4, wherein the double T beam has a web element introduced between two flange elements which additionally has a wavy structure transversely with respect to the machine direction.
 6. The carrier roll winder as claimed in claim 5, wherein the wavelength has a value which lies between one times the flange width and five times the flange width.
 7. The carrier roll winder as claimed in claim 1, wherein the ratio between the height and the width of the crossmember lies in a range between 0.8 and 3 times the width.
 8. The carrier roll winder as claimed in claim 1, wherein at least one of the flange elements and/or the web element has a honeycomb structure.
 9. The carrier roll winder as claimed in claim 8, wherein the honeycomb structure is formed by a layer of aluminum, steel or a fiber-reinforced plastic.
 10. The carrier roll winder as claimed in claim 1, wherein the crossmember consists wholly or partly of steel, of aluminum or of a highly loadbearing plastic reinforced by a glass or carbon fiber composite. 